Optimal quantum spectroscopy using single-photon pulses

Published 9 Oct 2025 in quant-ph | (2510.08386v1)

Abstract: We provide the ultimate precision attainable in spectroscopy of a quantum emitter using single-photon pulses. We find the maximum for estimating the linewidth to be independent of the details of the emitter's bare Hamiltonian while that for the detunings not to be so. We also identify optimal pulse shapes attaining these precisions.

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